1988Final results
1988 election for U.S. Senate in Arizona
U.S. Senate · Arizona
Dennis DeConcini (D) won with 56.7% of the vote, defeating Keith Degreen (R) by 15.7 points.
Dennis DeConciniDemocrat · winner
56.7%660,403
Keith DegreenRepublican
41.1%478,060
Rick TompkinsLibertarian
1.8%20,849
Ed FinkelsteinOther party
0.4%5,195
1,164,539 votes
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The seat over time
D − R margin in this seat's races around 1988
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Dennis DeConciniKeith Degreen
$2.8M
Raised by the campaign
$241K
$2.6M
Spent by the campaign
$238.4K
$510K
Cash on hand
$2.6K
Other candidates' campaigns: Rick Tompkins $1.9K.
Campaign money: FEC, through Dec 31, 1988; FEC, through Dec 30, 1988.
Source: FEC campaign filingsUpdated Dec 31, 1988
The candidates
Dennis DeConcini (D)Keith Degreen (R)
Also on the ballot: Rick Tompkins (Libertarian), 1.8%; Ed Finkelstein (Other party), 0.4%